Improvement in stjrfacing- articles op oast-metal



"mm lillilit .HI-RAM TUCKER, OF NEWTON, MASSACHUSETTS.-

Letters Patent No. 30,892, dated June 1, 1869. F I

"IMPROVEMENT m smacmc-a Annomas o3 chair-MET L.

1 The Schedule referred to in these Letters Pa tent and making part ofthe same.

YT; all whom it may concern Be it known that I, HIRAM TUCKER, of Newton,

"in the county. of- Middlesex, and State of Massachu isetts, haveinvented an Improvement in Surfacing Ar- :ticles oi Oust-Metal; and I dohereby declare that the following is a description of myinvention,sufficient to ena-hletboseskiliui' in heart to practise it.-

[My invention consists in articles of cast-metal which have raised, orsalient parts, coated by electro dcposit, and depressed, sunken, orreu'eating-surihces, coated with any of the compositions usual y knownas sealingwax, or any equivalent therefor, having a resinous base whichmelts and softensby heat, and which-burdens and adheres at all ordinarytemperatures of the-atmosphere. v 1' In the practice of my invention,the pattern for the casting is so made as to leave in relief thesurfaces I which are to be coyere'd by an electrodeposit, while, ladjacent to said surfaces, the suriaces which are to be covered with waxare sunken;

,the cast article, preferably heated to near the temperature of thefused wax, is dipped therein. The excess of wax is then scraped oti"from the soltially as described.

ient surfaces of "the casting, to avoid loss of material, i and saidsurfaces are theupolished, preferably by use of rotary griuders'andpblishers, after which the castings are coated, on their polished'orclean" metal surfaces, by an electrodeposit.

" The lines of contrast tlius formed are very clear and distinct, as the'eleetrotleposit doesnot ovcriap the wax, or the wax'theelectro-deposit, and both together] I thoroughly protect the oxidizablecast-metal base bee "Instead of p r c'ic' eedinll, as before described,thee-asting,';tfte r being'eleaned fronrsand and. other foreign 'matieiyisapolis'hed on its salient surfaces, and is then coated by aneiectro-deposi't, after which the electro- .-plated casting is to beheated, and wax applied to the depressed surfaces, on which it will fuseand coat by flowing oyerthem, any surplus being removed afterward fromthe salient surfaces; or iillpt ectro-plated casting may be dippediumelted' wax, and the salient. surfaces thereof are then afterwardfreed from the wax,

by wiping it off before it 00015, or by a scraping, rubhing, orpolisliin g-operatiou after thewax is cooled, which operation may bethat by which the electro- :plating li'ft s its lustre heightened, bypolishing or bur-- I clann ns a new manufacture, articles formed withraised and sunken surfaces, by casting, coated substan- HIRAM TUCKER.Witnesses: v W I J. B. CROSBY,

FRANCIS GOULD.

